One of the now-less-hidden floral gems of the "Emerald Necklace."

A Harvard-area eatery preserves the uncovered tiles of its century-old predecessor.

The murals have transformed a residential alley into a vibrant drive-through gallery.

Cemetery featuring rare glass-fronted columbarium.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

There are eight natural springs around town, each with a slightly different taste.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

No monkeying around, this fountain was really named after the classic sci-fi film.

The house where John Wilkes Booth conspired with his co-conspirators.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

An architecturally unique lighthouse that had to be lifted up and moved to avoid falling in the sea.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

Memorial to a beloved puppeteer as well as all street performers.

This is the house that spite built.

A small plaque promises cold, hard cash in exchange for work by the famous pop artist.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This unassuming stone commemorates a condiment factory gone up in smoke.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.